Abad, R. G. (1976). Soil in relation to socio-economic prolems in the Philippines [microform]. Photoduplication Service University of the Philippines Library.
芝加哥风格引文Abad, Ramon Gil. Soil in Relation to Socio-economic Prolems in the Philippines [microform]. Quezon City: Photoduplication Service University of the Philippines Library, 1976.
MLA引文Abad, Ramon Gil. Soil in Relation to Socio-economic Prolems in the Philippines [microform]. Photoduplication Service University of the Philippines Library, 1976.
警告：这些引文格式不一定是100％准确.